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Would anyone know the best solution to upgrade my radio to accept wireless capatability so that I can pair & play my mp3 or iPhone? does the radio have Blietooth capatability already or was 2003 too early?

I just researched this. 2003 is to early for wireless. I like the look of the business radio in the dash and didn't want to put a regular radio in there. I found that the best way to do it was to install the USA-Spec to the CD changer input. Works great. Need to plug the iPhone in but solved my problem.http://usaspec.com/product.php?Produ...eShowProduct=1

Was the install fairly straight-forward? Did you have to remove the HVAC vents above the radio to get to the back of the head unit to plug it in? Does it also attach to the battery directly, or just through the radio? I've seen them do it on YouTube and it looks fairly easy.

I found some info on the web for the Z4. It needs to plug in to the CD changer port, which you access from the middle of the truck on the firewall under the carpet. Then you feed the wires around the right side and fish them out of the subwoofer panel. Then to the center of the car and up to the front, tucking them under the plastic. My USA-spec module is wrapped in a sock up underneath the ashtray. I will see if I can find the directions.